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[英]Error when doing a PUTITEM type: <class 'str'>, valid types: <class 'dict'>
[英]Invalid type parameter class str, valid types class dict
所以我正在嘗試使用 put_item 同步 Dynamodb 表。 但是我遇到了一個問題。
Invalid type for parameter Item.Artist, value: No One You Know, type: <class 'str'>, valid types: <class 'dict'>
通過閱讀使用 put_item 時的文檔,它需要一個字典,所以基本上是這樣的:
'{'Artist': {'S': 'No One You Know'},'SongTitle': {'S': 'Call Me Today'}}'
為了正確添加它。
這是我的代碼:
#!/usr/bin/python3
import boto3
source = boto3.resource('dynamodb', 'us-east-1')
dest = boto3.client('dynamodb', 'us-west-2')
def sync(source, dest):
table = source.Table("myMusic")
scan_kwargs = {
'ProjectionExpression': "Artist, SongTitle"
}
done = False
start_key = None
while not done:
if start_key:
scan_kwargs['ExclusiveStartKey'] = start_key
response = table.scan(**scan_kwargs)
for item in response['Items']:
dest.put_item(TableName="myMusic", Item=item)
#print(item)
start_key = response.get('LastEvaluatedKey', None)
done = start_key is None
sync(source, dest)
因此,如果我取消注釋打印語句,我會得到:
{'Artist': 'No One You Know', 'SongTitle': 'Call Me Today'}
有什么方法可以對 output 進行消毒或添加額外的必需的“S”,或者我是不是走錯了路?
在您的代碼中的某個階段,您將在取消注釋打印語句時打印您所說item = {'Artist': 'No One You Know', 'SongTitle': 'Call Me Today'}
。
使用以下代碼片段:
newItem = { 'Artist': {}, 'SongTitle': {} }
newItem['Artist']['S'] = item['Artist']
newItem['SongTitle']['S'] = item['SongTitle']
所以整個代碼變成:
#!/usr/bin/python3
import boto3
source = boto3.resource('dynamodb', 'us-east-1')
dest = boto3.client('dynamodb', 'us-west-2')
def sync(source, dest):
table = source.Table("myMusic")
scan_kwargs = {
'ProjectionExpression': "Artist, SongTitle"
}
done = False
start_key = None
while not done:
if start_key:
scan_kwargs['ExclusiveStartKey'] = start_key
response = table.scan(**scan_kwargs)
for item in response['Items']:
####################### SNIPPET #######################
newItem = { 'Artist': {}, 'SongTitle': {} }
newItem['Artist']['S'] = item['Artist']
newItem['SongTitle']['S'] = item['SongTitle']
####################### SNIPPET #######################
dest.put_item(TableName="myMusic", Item=newItem)
#print(item)
start_key = response.get('LastEvaluatedKey', None)
done = start_key is None
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